Particle Morphology

This chapter discusses the morphology of latex particles obtained mainly by (mini)emulsion polymerisation. It describes some applications of these particles, and discusses the factors that influence the particle morphology. Mathematical models that describe and predict the particle morphology as a function of polymerisation variables are presented along with some experimental examples. Structured polymer particles can be synthesized by chemical and physical methods. Among the physical methods, heterocoagulation and solvent evaporation have been used to produce capricious particle morphologies. Synthetic latexes are mainly used in applications (e.g., paints, adhesives, paper and coatings) that require the formation of a film. Film formation is described as consisting of three main processes: (i) evaporation of water to achieve the close-packing of particles, (ii) deformation of particles to fill all the void space, and (iii) interdiffusion of the polymer across particle interfaces to fuse particle boundaries

Emulsion copolymerization : process strategies and morphology

Keywords: emulsion copolymerisation; polymer chains; latex products; monomer partitioning; polymer-polymer tensio

Emulsion copolymerization : process strategies and morphology

Keywords: emulsion copolymerisation; polymer chains; latex products; monomer partitioning; polymer-polymer tensio

Evidence of branching in poly(butyl acrylate) produced in pulsed-laser polymerization experiments

Branched poly(Bu acrylate) was obtained from pulsed-laser polymns. carried out in bulk and in soln. between -16 and +60 DegC. The predominantly short branches are formed by backbiting. The Arrhenius temp. dependence of the backbiting rate is calcd., and the activation energy of this process was found to be remarkably higher than that of propagation. Branching thus increases with temp. leading to broader SEC traces and difficulties in the accurate detn. of the rate of propagation. [on SciFinder (R)

Evidence of branching in poly(butyl acrylate) produced in pulsed-laser polymerization experiments

Branched poly(Bu acrylate) was obtained from pulsed-laser polymns. carried out in bulk and in soln. between -16 and +60 DegC. The predominantly short branches are formed by backbiting. The Arrhenius temp. dependence of the backbiting rate is calcd., and the activation energy of this process was found to be remarkably higher than that of propagation. Branching thus increases with temp. leading to broader SEC traces and difficulties in the accurate detn. of the rate of propagation. [on SciFinder (R)